ALEXANDRIA, Va., Oct. 28 -- United States Patent no. 12,447,774, issued on Oct. 21, was assigned to SUMITOMO RUBBER INDUSTRIES LTD. (Kobe, Japan).
"Tire" was invented by Yohei Maeda (Kobe, Japan).
According to the abstract* released by the U.S. Patent & Trademark Office: "A tire includes a tread portion having a ground contacting surface and a first groove. A tread rubber forming the tread portion includes a first rubber layer and a second rubber layer. The second rubber layer has a complex elastic modulus smaller than a complex elastic modulus of the first rubber layer. The first groove includes a first groove edge, a groove bottom surface, and a first groove wall. In a lateral cross section of the first groove, the first groove wall inc...